Your grammar is fine.
PSU: make, model, wattage, age, condition?
Disk drive(s): make, model, capacity, how full?
Verify: RAM is 8 GB total? Configuration?
While playing use Task Manager or Resource Monitor to observe system performance. Use both tools but only one tool at a time.
Determine what system resources are being used when the lagging or freezing occurs.
Also determine to what extent (%) the resource is being used and what is using the resource.